Chimney or flue cowl



(No Model.)

J. L. G'HARVAT. CHIMNEY 0R PLUB GOWL.

No. 489,459. Patented Janjlo, 1893.

l NITED STATES ATENI union.

CHIMNEY OR FLUE COWL.

SPECIFICATION forming part of Letters Patent No. 489,459, dated January 10, 1893.

Application filed December 24, 1891. Serial No. 416.058. (No model.)

or flue to escape on the side which is not disturbed by the wind.

The invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings and pointed out in the claim hereto appended.

In the drawings-Figure 1 is a perspective View of a cowl constructed in accordance with this invention. Fig. 2 is a vertical sectional view. Fig. 3 is a similar view taken at right angles to Fig. 2.

Like numerals of reference indicate corresponding parts in all the figures of the drawlugs.

1 designates a cowl designed to be mounted on a chimney or flue, and adapted to be employed as a ventilator and comprising a rectangular casing 2, and a centrally depending pipe 3 communicating with the casing. The casing 2 is rectangular in section and is provided with flaring ends at; and arranged within the casing is a V-shaped damper which is secured to a rod or shaft 6 journaled in the sides of the casing. The V-shaped damper 5 is composed of inclined sections 7, which have their upper ends secured together, and are arranged to close the mouth of the pipe 3 at one side, which is disturbed by the wind, and to leave the opposite side which is not disturbed by the wind, open. The wind in blowing through the casing strikes one of the damper sections and closes the pipe at that side by forcing the said damper section down against the bottom of the casing. This raises the other damper section and leaves the other side of the pipe open. The damper is arranged a short distance below the top of the casing to provide a space to cause sufficient draft, to carry off smoke when the device is attached to a chimney, and to carry off foul gases when employed as a ventilator.

In order to prevent the damper sections striking violently against the bottom of the casing, counterbalanoing rods 8 are secured intermediate their ends to the rod or shaft 6. The counterbalanoing rods are arranged on the outside of the casing, and are provided at their ends with weights 9 which prevent the damper moving too quickly.

It will be seen that the damper is located directly above the pipe 3 and is of a length exceeding the diameter of said pipe.

In the accompanying drawings the casing is shown rectangular in cross-section but it may be of any other shape, and I desire it to be understood that I do not limit myself to the exact details of construction as I may without departing from the spirit of the invention make minor changes therein.

The device is especially adapted for ventilation and kindred purposes, and it may be employed in cars or other vehicles to draw the dust out of them owing to its peculiar construction of damper, the movement of the vehicle producing sufficient draft to cause this result.

The opening or mouth of the casing by being flaring or funnel shaped draws in much more air than it would were it straight and of the same diameter as the rest of the casing; and the air drawn in is compressed thereby producing a forcible draft.

What I claim is The combination with a pipe or flue, of a casing rectangular in cross-section mounted on the pipe or flue and having an opening in its bottom communicating with the pipe or flue, said casing being provided with flaring ends, a transverse shaft journaled in the sides of the casing and having its ends extended beyond the same, a V-shaped damper secured at its apex to the shaft and depending therefrom and arranged within the casing above the opening in the bottom thereof, said damper being of a length exceeding the diameter of the pipe or flue, and the counterbalancing rods arranged at each side of the my own I have hereto affixed my signature in easing on the outside thereof and extending the presence of two Witnesses. longitudinally of the same and being centrally secured to the extended end of the JOSEPH GHARVAFI" 5 shaft, the ends of the counterbalaneing rods Witnesses:

being weighted, substantially as described. J. J. KILBRIDGE,

In testimony that I claim the foregoing as A. T. VAN SICKLE. 

